Printing-machine.



s. a o-u'simm. YRWT'ING'MACHIN EEEE 2 SHEETS I gunman s'rarns PATENT. orrron.

cnaRLrsHoUsEMAN. or ROCHESTER. NEW YORK.

PRINTING-MACHINE.

j specification.

f Thepre sent invention relates to printing machines, and more particularly to thetype "which ruptures or breaks the paper in order that the ink-may penetrate the fibers of the paper and thus render the surreptitious changing of the printed matter difficult or impossible without detection. An object of the invention isto'provide an improved paperrupturi ng surface which may be used with flat-faced-type without unduly defacing the type faces. .Another object of the inventionis to provide a paper rupturing device with an unyielding surface adapted tohe interposed between the printing mechanism. and the platen of a printing machine, such, for instance, as 'a typewriting machine. Still another. object of the invention is to 'prot'ide, a paper rupturing device in the form of an attachment which may beappliedto any 'typewriting. machine having a given cylinder xdiameter without the employment of a. skilled mechanic. A still further object of-the invention is to provide a ,aper rupturing device for cooperating with thetype faces of a' typewriting machine,

' such device beingmovable into and out of operative position at will. so that the typist may employ. the usual platen for ordinary,

work,' or the, paper rupturing device for work .which requires protection, and' this without removing the ordinary platen.

To these, and other ends. the invention consists of certain parts and combinations of' parts, all of Which will be ',hereinafter-described, thenovelfeatures being pointed out in the a pended claims. 1

In the drawings -:1

machine with the present invention applied thereto "and in operative position; Fi Q 2 is a perspective-view of the attachment; a 1

Fig.- 3 shows an enlarged "section of the' attachment; 4 p i Fig; '4 is aviewfof the typewritmg' machine when the attachment is, thrown to operative position;

. Specification of Letters Patent.

i Application filed February 8. 1918.

Figure 1 is a front view of a typewriting Patented Dec. 2.4., 1918.

Serial No. 216,126.

Fig. 5 shows the attachment thrown to inoperative position so that the ordinary platen may be employed;

Fig. 6 is an enlarged detail view produced by this machine and Fig. 7 is an enlarged section through the work showing the manner in which the latter is ruptured.

The.invention is illustrated herein as an attachment fora typewriting machine of the type known commercially as the Corona. It is apparent, however, that the invention is not limited to'useon machines of this type, and is not, in fact, limited to typewriting machines. but is capable of being em-, bodied in any printing machine in which there is employed a printing mechanism. The machine illustrated embodies a printing. mechanisn of the type-bar type having a plurality of type bars 1 operable from keys of work .2 of a keyboard, the type bars being movable upwardly to impinge an inking ribbon 3 of an inking means disposed in front of a platen 4. The'faces of the type are plane,

and the surface of the platen is, as usual, slightly yielding, so that the impression of the type will be made upon a sheet of paper interposed between the inking ribbon 3 and the platen, all of these parts being-the same as like parts of the Corona machine.

.In order that the work produced by the machine may be ruptured or broken at the time that the printing takes place, there is provided a paper rupturing device which, in this instance, comprises a rigid member A in the form of a segment of a thin hollow cylinder, the length of the member being substantially equal to the length of the roller platen 4, and the curvature being such that the inner or under face will conform to the face-of the roller'platen. The outer face of this paper'rupturingdevice is roughened or serrated so that type striking against tlfe I paper rupturing device will cause the paper to be broken at the same time that the print ing'takes place. T he form-of the serrations of the'paper rupturing device is novel, and

'this' feature ,is capable of use in any printing machine having smooth faced type for 09- operation therewith. This surface in thls instance'comprise's alternate grooves 5 and ridges 6, the tops of the ridges being-flat, as

at 7 and the sides of the tops being sharp,

as at 8. With this arrangement, when the typepresses the paper against the paper rupturing device, thepaper will be comenter the grooves and be cut or ruptured at 10 by the edges 8. Owing to the fact that the fiat faces of the type strike againstthe flat tops 7 ofthe ridges, less injury to the type occurs-thanit would if the tops of the ridges were sharp edges. It is preferable that the type faces shall be hardened steel,

so that the defacement of the type is substantially prevented. I

Owing" to the fact that the paper rupturing device is, in this instance, in the form of a segment of a thin hollow cylinder, it

roller 4:. A handle 11 may be provided at' the rear edge of the paper rupturing member A in order that said member may be readily shifted into and out of aposition between the "platen and the printing mechanism.

From the foregoing it will be seen that there has been provided a aper rupturing device which has a sur ace alternately grooved and ridged with the tops of the ridges flat in order to cooperate with the flat faces of the type of a printing mechanism, this paper rupturing surface being capable of use with any suitable printing mechanism. There has also been provided a paper rupturingdevice which may have a rupturing surface such as described, or any other rupturlng surface, such device being adapted to be interposed at will between. a platen and a printing mechanism so that the latter may cooperate with the platen. or

with the paper rupturing device, the surface of this'paprr' rupturing device being 'iiWhat I claimas m I invention a nd desire pressed between the flat top -7 of the ridges and the flat faces of the type, While those portions of the paper between the ridges will to secure by Letters atent is'fa f-l. In combination .Witha printingmechas nism and aplatenfor coiiperationwith the prmting mechanism; arigid device having an unyielding and substantially permanent paper-rupturing surface for 'cooperation' with the faces of thetype of the printing mechanism, said device being .movable 0n the machine to. either one of two positions, one position between the platen and the printing mechanism so that its paper-rupturing surface may be engaged by the printing mechanism while the device rests against the, platen, and the other position in which the device is out of the pathof the printlng mechanism and the latter may cooperate with the platen without engagement with the paper-rupturing surface.

2.' In combi atlon wlth a type ing mechanism and a roller platen for cobar -print-' operating therewith; a rigidmember having its rear face curvedtoconform to the sur? face of the platen and having an unyielding and substantially permanent paper-ruptur- 'ing surface for engagement by the'. faces 0f the type of the printing mechanism; saidrigid member partially covering said roller.

platen and being movable about the lon tudinal axis of the platen to expose the p ate'n for;- cooperation with the prmting mechas. nism or to bring the paper-rupturlng sar face in position for engagement with the.

faces of the type of the printing mechanisln A paper rupturing device "for attaehl.

ment to roller platens'of printing machines, comprising a rigid member having the. form of a segment of a hollow cylinder to con form to the surface of the platen and an unyielding and substantially permanent paj per rupturing surface for cofiperation :with

the type faces of the printing mechanism.

' 4. In combination with a printing mechanism having smooth faced type, agape! rupformed with ridges and grooves, the tops of the-ridgesbeing flat- CHARLES HOUSEMAN. 

